Stopwatch
Ready
00:00:00.00
Hours, minutes, seconds and hundredths
A precise, distraction-free stopwatch for everyday timing.
When to reach for a stopwatch
Use a stopwatch when the question is how long something takes rather than how long is left: a rehearsal run, a build step, a lap, a support call. Start, pause and resume as often as you need — paused time is simply not counted.
Accuracy
Elapsed time is measured against a monotonic browser clock, so it is unaffected by the system clock being corrected while the stopwatch runs. The display shows hundredths of a second; treat it as accurate to a few hundredths rather than to the millisecond, since browser timers are deliberately coarse.
Questions
- Does the stopwatch keep counting in a background tab?
- The elapsed time stays correct, because it is measured against a clock rather than counted, but the display refreshes less often while the tab is hidden.
- Is there a lap function?
- Not yet. For structured repeats, the interval timer counts rounds of work and rest for you.